package com.slimbloody;

import java.math.BigDecimal;
import java.util.LinkedHashMap;

public class LinkedHashMapTest2 {
  public static void main(String[] args) {
    LinkedHashMap<Integer, BigDecimal> map = new LinkedHashMap<>();
    map.put(1, null);
    if (map.containsKey(1)) {
      System.out.println("yes");
    } else {
      System.out.println("no");
    }
  }
}
